Blue monoazo dyes and process of making same.



No Drawing.

HEINZ E-ICHWEDEJ'Q UNTERLIEDERBACH, NEAR, HocHsnoN-rnniaiim, ennia ASSIGNOR TojFAn WEnKE VORM. MEIsTnR LUCIUS THE-MAIN, GERMANY, A CORPORATION/F GERMANY.

$1, BRUIIING; OF ZHOCHST-ON- BLUE MONOAZG DYES ANJJPROCESS OF MAKING SAME.

To n7? 'u-fiom it may concern Be it known that I, Hun-z. Eier'iwensy P11. DJ; chemist. a citizen of the Empire of (lerniany. residing at Unterliederbaeh, near .Hiichst-on-the-Main, Germany, have invent ed certain new and useful Improsements'in Blue Monoazo Dyes and Processes of Mali:-

" ing Same, of which the following is a specification. a

' I have found that, fast blue wool dyestuffs are vobtained possessing the valuable property of giving perfect dyeings on wool even n a neutral bath, by combining the (haze compounds of l-ammo-s-naphtholmonosul- V fomc acids.

fonic acids with aryl-l-naplithylamin-8-sul- The following example illustrates rhymventionv: 23.9 kg.'of 1-amin0-8-naphthol-45 "sulfonic acid lare diazotized with 25 kg; of hy(lrochlor1c-a cid of 20B.- and 7 kg. of

nitrite. Thel'yellowish browndiazo compqiyid which separates is introduced into a so it phenyl-Lnaphthylaniin-8-sulfonic acid and there is then added sodium acetate'or sodium carbonateuntil the acid reaction has disap- 'p'eared. After'having hea ted the whole for a short time, the coloring matter is separated, from the solution rendered alkaline. The dyestuif thus obtained forms, when dry, a violet-black powder and dyes Wool, both in'a slightly acid bath and in a neutral bath a pure blue tint of excellent fastnessto tints of same what I claim is: i

7 1. The. process of manufacturing blue monoazo dyestufis, winch consists in com+ billing the diazo compounds of a l -amino 8- I naphtholmonosulfonic acid with an ar vl-lnaphthylamin-8-snlfonic acid.

in a slight acid orin a neutral'bath pure ion of 32.1 kg. 'fofthe sodium salt of.

Specification of Letters Patent. PggfientgfiJ 1 2? 9 Application filed A ril 9, 1915. Serial No. 20,301.

2" The process of manufacturing a blue 50 .nionoazo dyestufi' which consists incombinformula;

wherein X stands for the residue of-a naphs thol-monosulfonic acid the hydroxyl group of which stands i118 position tothe diazo group which vdyestufl's are, when dry,-i'nthe form of sodium salts violet-black powders, readily soluble in water, dyeing wool blue tints of great fastness to washing and milling as well as to rubbing and .to the light. I j

4. Asa new article of manufacture, the

idyestufi of the formula: 6

which dyestuil isywlien dry,- 9; v'ioletblack: powder, readily soluble in. waten dyeing wool in a slightly acid or in a. neutral. bath. pure blue tints ofgreat fa'stness to Washing I and milling as well astorubbing' and to the 9 light.

In testimon" whereoflaflix my signature in presence 0 two witnesses.

V HEINZ EICHWEDE;

Witnesses:

- JEAN GRUND, Calm Geunn. 

